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Finding the Fourth Proportional to 9,989.88, 13,773.20 and 8,190.74

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Solution

The fourth proportional to 9,989.88, 13,773.20 and 8,190.74 is: 11,292.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,989.88 : 13,773.20 = 8,190.74 : x
  2. Step 2: Convert to fraction form
    9,989.88/13,773.20 = 8,190.74/x
  3. Step 3: Cross multiply
    9,989.88x = 13,773.20 × 8,190.74
  4. Step 4: Simplify right side
    9,989.88x = 112,812,700.17
  5. Step 5: Solve for x
    x = 112,812,700.17/9,989.88
  6. Step 6: Final answer
    x = 11,292.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.